Pneumatic tire.



No. 646,709. Patented Apr. 3, I900.

F. A. SEIBERLINR PNEUMATIC TIRE.

I (Application filed Jan. 15, 1900.\ (No Model.)

Tu: nomus PETERS co. Pnoro'uwou' wnsummu. o. c.

UNITED STATES- PATENT @FFICE.

FRANK A. SEIBERLING, OF AKRON, OHIO.

PNEUMATIC TIRE.

SPECIFIGATIONfor-mirigpart of Letters Patent No. 646,709, dated April 3, 1900.

Application filed January 15,1900. Serial No.1,466. (No model.)

1'0 ML whom it may concern:

Be it known that I, FRANK A. SEIBERLING, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Pneumatic Tires, of which the following is a specification.

My invention relates to pneumatic tires having an inner closed air-tube and an outer sheath or covering; and the object of my invention is to permit the construction of a tire of this kind in such a manner that it may be vulcanized as a whole without causing the contacting surfaces of the air-tube and the sheath or cover to unite or adhere.

My invention consists in such a construc= tion and arrangement of parts that the airtube and cover are prevented from uniting during vulcanization, and this I accomplish by constructing the air-tube of an inner layer of rubber and an outer layer of fabric adhering thereto and theouter sheath or cover of an outer layer of rubber and an inner adhering layer of fabric, the fabric of both the airtube and the cover being napped on their contiguous surfaces in such a manner as to prevent their adhesion when the tire is'vulcanized.

My invention is illustrated in the accompanying drawings, in which-- Figure l is a broken perspective view of a section of a'tire, and Fig. 2 is a cross-sectional view thereof.

In said drawings, 3 represents the inner air-tube, which is composed of rubber, and 4 an adhering layer of fabric or friction-cloth. The external surface of this friction-cloth is napped or roughened, as shown at 5. The outer sheath or coveris composed of an external layer of rubber 6 and an interior layer of fabric or friction-cloth 7, which is also napped or roughened on its exposed surface, as shown at 8.

In forming a tire according to my invention the inner air-tube is first formed upon the rod or mandrel by applying the layer of rubber and then the layer of friction-cloth napped upon its exterior. Thereafter the sheath is built up by applying first the layer of friction-cloth napped upon its inner side and thereafter applying the outer covering of rub ber. The whole may then be vulcanized at a single operation, the ends of the tubes being previously joined by telescoping or otherwise. During such process of vulcanization the napped surfaces will. prevent the adhesion or uniting of the inner main tube and the outer sheath or covering, thus providing a tire having the same convenience of repair or renewal as adouble-tube tire and of equal simplicity and economy of construction as a single-tube tire. In fact the inner air-tube of my improved tire is better than the usual air-tube of the double-tube tire because it is composed of a strong layer of fabric and of rubber which is made endless and the joints made to disappear by the process of vulcani zation. When it becomes necessary to apply a new sheath or cover or a new inner air-tube, as the case may be, it will be necessary, of course, to sever the outer sheath or cover to renew it or to permit access to the inner air= tube; but in either case the whole of the tire 'need not be discarded Where the injury or damage has been done to one member only of the tire, I

The napped surfaces not only prevent unit'- ing during vulcanization, but they further prevent any creeping or longitudinal move-' ment of either of the tubes with reference to the other.

1. A pneumatic tire comprising in combi' nation an inner air-tube and an outer sheath or covering, said tube and said sheath having their contiguous surfaces napped to prevent cohesion during the process of vulcanization, substantially as described.

2. A pneumatic tire comprising in combi nation an inner air-tube composed of a layer of rubber and an outer layer of fabric napped on its exterior, and an outer sheath or cover composed'of an external layer of rubber and an internal layer of fabric also napped onits interior, substantially as described.

FRANK A. SEIBERLING. 

